Remove all references to Partition class

examples/kafka_producer.cpp

@@ -14,7 +14,6 @@ using std::endl;
 using cppkafka::Producer;
 using cppkafka::Configuration;
 using cppkafka::Topic;
-using cppkafka::Partition;
 using cppkafka::MessageBuilder;
 
 namespace po = boost::program_options;

include/cppkafka/producer.h

@@ -42,7 +42,6 @@ namespace cppkafka {
 
 class Topic;
 class Buffer;
-class Partition;
 class TopicConfiguration;
 
 /**